Rao, A. V. Rama; Chanda, Bhanu M.; Borate, Hanumant B.
Synthetic Communications, 1984 , vol. 14, # 3 p. 257 - 264

Cristau, Henri-Jean; Bazbouz, Akram; Morand, Philippe; Torreilles, Eliane
Tetrahedron Letters, 1986 , vol. 27, # 26 p. 2965 - 2966